skeletal system a. regulates supply of gases from ATP production

G endocrine system b. provides negative feedback signals
C immune system . protects body against foreign dangers
I reproductive system d. “rapid transit” for liquids and gases
F muscular system . primary “regulator” of sensory functions
circulatory system . provides support and means of motion
digestive system . processes materials for growth and maintenance
respiratory system h. makes cells used in circulatory system
J excretory system . only system in which meiosis occurs
E nervous system . takes out what's not wanted in the blood